Next project - 402 or 418 stroker - piston question
07-09-2014, 08:41 AM
#21
I'm not sure... the later IVC would seem to want more compression, but the 4" stroke changes the dynamics and most big power strokers are still relatively mild in compression when looking at the cams, etc. It's one of those things I've never fully understood, but would like to...
07-09-2014, 09:01 AM
#22
I'm not sure... the later IVC would seem to want more compression, but the 4" stroke changes the dynamics and most big power strokers are still relatively mild in compression when looking at the cams, etc. It's one of those things I've never fully understood, but would like to...
07-09-2014, 11:32 AM
#24
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427 I don't want 2 seem rude but if we were 2 do a cost to HP ratio...on pump gas my
LQ9 stroker with Frankenstien LS3 heads & a solid roller was Dirt cheap well under 7000 grand and I bought every part, also... I will not take Anything less than 700fwhp under 7500rpm or this was just a USE-LESS BUILD.
LQ9 stroker with Frankenstien LS3 heads & a solid roller was Dirt cheap well under 7000 grand and I bought every part, also... I will not take Anything less than 700fwhp under 7500rpm or this was just a USE-LESS BUILD.
Any how, I'm currently at 580 wheel NA and 700 on a 100 shot. There's a few more additions that have to be made, like a fast 102 and tighter headers as 2" headers are just too much for an NA motor. It runs like a scolded dog and can be beat on until the cows come home.
Jake, my apologies if this mucked up your thread buddy. Personally, now having both cathedral ports and rectangular ports, I can tell you the endless power band of the rectangular port is straight intoxicating! They never seem to run out of air!
07-09-2014, 11:37 AM
#25
I'd leave the 2" headers on that thing.
Btw, I can't seem to find shelf pistons for the 4.07" bore that give me what I want from Wiseco or Diamond and spending the extra for custom is not exactly in line with my overall goals... So 402 it looks like or maybe a 408 if I can stomach the iron block weight. The good thing from the 408 is I reuse my ARP head bolts, Rollmaster timing set, and my new LS6 valley cover I installed. Those things, individually, are not that expensive, but when you buy multiple parts over and over again... well it gets stupid.
Given the 226cc ports and 2.04" valve (think I'll just keep those so I can add more duration/overlap) the flat tops with the chambers opened to 66cc will net me around 12.1:1 CR with .035" quench. An EPS 248/254 113+3 would work well in that setup and make power everywhere given the smaller ports and valve size relative to the bore.
Btw, I can't seem to find shelf pistons for the 4.07" bore that give me what I want from Wiseco or Diamond and spending the extra for custom is not exactly in line with my overall goals... So 402 it looks like or maybe a 408 if I can stomach the iron block weight. The good thing from the 408 is I reuse my ARP head bolts, Rollmaster timing set, and my new LS6 valley cover I installed. Those things, individually, are not that expensive, but when you buy multiple parts over and over again... well it gets stupid.
Given the 226cc ports and 2.04" valve (think I'll just keep those so I can add more duration/overlap) the flat tops with the chambers opened to 66cc will net me around 12.1:1 CR with .035" quench. An EPS 248/254 113+3 would work well in that setup and make power everywhere given the smaller ports and valve size relative to the bore.
07-09-2014, 12:49 PM
#26
If you are going to run 12.1:1 compression I would run as good a cold air intake as you can buy. Also look into a big radiator and fan(s) that will keep the temperatures down. If things get on the warm side the ECM will pull timing and defeat your gains.
Last edited by 1989GTA; 07-09-2014 at 08:41 PM.
07-09-2014, 02:04 PM
#28
You ever notice how when some people say "not be a" or "with all due respect" they think it gives them the opprotuinty to state whatever they feel without recourse? Also knowing that's exactly what they're trying to be!
Any how, I'm currently at 580 wheel NA and 700 on a 100 shot. There's a few more additions that have to be made, like a fast 102 and tighter headers as 2" headers are just too much for an NA motor. It runs like a scolded dog and can be beat on until the cows come home.
Any how, I'm currently at 580 wheel NA and 700 on a 100 shot. There's a few more additions that have to be made, like a fast 102 and tighter headers as 2" headers are just too much for an NA motor. It runs like a scolded dog and can be beat on until the cows come home.
07-09-2014, 02:25 PM
#30
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I'd leave the 2" headers on that thing.
Btw, I can't seem to find shelf pistons for the 4.07" bore that give me what I want from Wiseco or Diamond and spending the extra for custom is not exactly in line with my overall goals... So 402 it looks like or maybe a 408 if I can stomach the iron block weight. The good thing from the 408 is I reuse my ARP head bolts, Rollmaster timing set, and my new LS6 valley cover I installed. Those things, individually, are not that expensive, but when you buy multiple parts over and over again... well it gets stupid.
Given the 226cc ports and 2.04" valve (think I'll just keep those so I can add more duration/overlap) the flat tops with the chambers opened to 66cc will net me around 12.1:1 CR with .035" quench. An EPS 248/254 113+3 would work well in that setup and make power everywhere given the smaller ports and valve size relative to the bore.
Btw, I can't seem to find shelf pistons for the 4.07" bore that give me what I want from Wiseco or Diamond and spending the extra for custom is not exactly in line with my overall goals... So 402 it looks like or maybe a 408 if I can stomach the iron block weight. The good thing from the 408 is I reuse my ARP head bolts, Rollmaster timing set, and my new LS6 valley cover I installed. Those things, individually, are not that expensive, but when you buy multiple parts over and over again... well it gets stupid.
Given the 226cc ports and 2.04" valve (think I'll just keep those so I can add more duration/overlap) the flat tops with the chambers opened to 66cc will net me around 12.1:1 CR with .035" quench. An EPS 248/254 113+3 would work well in that setup and make power everywhere given the smaller ports and valve size relative to the bore.
07-09-2014, 02:36 PM
#31
Yeah I guess I'm not following. To me, 11.5:1 compression and big cams don't really conflict for power. Larger cams need the longer durations and the static compression looks good for pump gas. I thought you were saying the DCR seemed too low to make good power.
07-09-2014, 06:21 PM
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So we are talkin $5800 + tax & $250- 800 for a good used core we still @ $6200- 6300 that is alot @ 1 time as I don't do credit only cash... no intrest on my own $
Now I will be spending on build & dyno time... LME = Total is right around 9 grand close to 10 complete. 427 you have a great set- up but, not 4 a Baller on a Budget.
also 510 is damn good... a guy whos home we were doing friend in League City, had a E85 Black 427 ZO6 with H/C/I work done... Beast.
Now I will be spending on build & dyno time... LME = Total is right around 9 grand close to 10 complete. 427 you have a great set- up but, not 4 a Baller on a Budget.
also 510 is damn good... a guy whos home we were doing friend in League City, had a E85 Black 427 ZO6 with H/C/I work done... Beast.
Last edited by lil john; 07-09-2014 at 06:30 PM.
07-09-2014, 07:10 PM
#36
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Jake try calling JE about there new piston all will be from 7 to 9 hundred bucks... trying to get a restock now myself on pistons. I will lose some coin but I like new better products as with my Vic Jr intake now another $475.oo for the Super Vic LS3 EFI intake. Cheap HP. But @ some cost.
07-10-2014, 06:51 AM
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I am with U ..... but WT. savings and being stonger over rule LIKES...& dislikes. Price is same or $5 more per. piston... JE got what your looking 4 ... callem and compare $ and the overall piston design.
07-10-2014, 07:00 AM
#39
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got 2 go but.... I sent pistons back... To get the upper edge = more HP.
I did a post on the new JE piston look it up. My pistons from JE will cost 895 but I lost some on the restock fee from Wiseco... I could send them back because It was not a custom piston.
I did a post on the new JE piston look it up. My pistons from JE will cost 895 but I lost some on the restock fee from Wiseco... I could send them back because It was not a custom piston.
07-10-2014, 08:20 AM
#40
Thanks JP...
Yes, mine is a 414ci build making 560/535 on a hot humid day.... I too am going to spray it w a 150 shot soon...
Callies Compstar, 4.125 crank, TEA worked 799's... Ported FAST 102, HS 1.8's.. It's a fun fun car... and still gets 24-25mpg on the hwy in 6th gear w the Ac blaring...
Yes, mine is a 414ci build making 560/535 on a hot humid day.... I too am going to spray it w a 150 shot soon...
Callies Compstar, 4.125 crank, TEA worked 799's... Ported FAST 102, HS 1.8's.. It's a fun fun car... and still gets 24-25mpg on the hwy in 6th gear w the Ac blaring...
Jake, to give you a good barometer for this build if you do it, I'm going to get my buddy who has a LS2 based 414 to chime in. He's running stage 3 ported TEA 243's a 247/255 cam on LSL lobes and 1.8 Harland sharpe rockers and has had great results. 560 wheel and over 530 ft/lbs. It's a torque monster!