383 stroker question and questimate
05-13-2010, 09:03 AM
#21
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Ive never really looked into a super charger. I dont think I have the cash flow for that option.
I'm guessing your budget is on the smaller side since you don't want to buy new pistons but you really should be matching all your parts to work together.
What I mean is, a good piston that compliments a good head that compliments a good cam grind. The problem you are running into is you are stuck with incorrect pistons and now your compromising your top end to match an incorrect piston. If there is any wiggle room in the budget I'd look at the option of new pistons. Even if it sets you back some time. Do it once do it right. However, with the smaller CC heads you'll be able to play with your CR based on gasket thickenss more effectivley. (easier to raise and lower the CR)
Give another reputable builder in your area a call and see what he says about what you have. Doesn't hurt to ask!
Would you be against a super charger? That would compliment the 9.5:1 compression nicley!!!!
~Jim~
What I mean is, a good piston that compliments a good head that compliments a good cam grind. The problem you are running into is you are stuck with incorrect pistons and now your compromising your top end to match an incorrect piston. If there is any wiggle room in the budget I'd look at the option of new pistons. Even if it sets you back some time. Do it once do it right. However, with the smaller CC heads you'll be able to play with your CR based on gasket thickenss more effectivley. (easier to raise and lower the CR)
Give another reputable builder in your area a call and see what he says about what you have. Doesn't hurt to ask!
Would you be against a super charger? That would compliment the 9.5:1 compression nicley!!!!
~Jim~
05-13-2010, 09:05 AM
#22
Check this site out it'll calculate CR for you based on the entries of your build. It'll give you a better idea of how big of heads you need and gaskets. By my entries you need a 58cc or 60cc head.
http://www.csgnetwork.com/compcalc.html
~Jim~
http://www.csgnetwork.com/compcalc.html
~Jim~
05-13-2010, 09:16 AM
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Looks like if i use a .041 compressed gasket, zero deck the block and a 64cc head i would get 9.85:1 cr. This looks to be pretty good to me. I would have a good quench and a decent CR
05-13-2010, 10:03 AM
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Well its not that im dead set on the 64cc chambers. Its that I know I can get a set of 195cc afr heads that flow great out of the box and be done with it. Thanks for the help man I really do appreciate it. I will let you guys know what it make after I get it all assembled. It should be about 2 months
05-14-2010, 10:34 AM
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Ok i have finally made my mind up on my combo.
68cc afr 195cc heads 9.43:1 CR
all else the same as stated before
heres the dyno from DynoSim
RPM HP TQ
2000 147 385
2500 185 389
3000 239 419
3500 304 456
4000 364 479
4500 419 490
5000 457 461
5500 483 461
6000 490 427
6500 456 368
Ya gotta love those AFR heads....
I could easily run this on the med grade gas maybe regular.
68cc afr 195cc heads 9.43:1 CR
all else the same as stated before
heres the dyno from DynoSim
RPM HP TQ
2000 147 385
2500 185 389
3000 239 419
3500 304 456
4000 364 479
4500 419 490
5000 457 461
5500 483 461
6000 490 427
6500 456 368
Ya gotta love those AFR heads....
I could easily run this on the med grade gas maybe regular.
07-23-2011, 01:06 PM
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I'm thinking it will pull to about 5800 rpm till it starts to drop off. My hyd roller 383 has the 190cc freedom heads with comp cams 540/562 lift at 240-248 dur with 1.6 int and 1.5 ex. rockers rpm air gap intake 750 hp holly carb with about 10.8-1 comp 37 total timing longtube headers and msd and i run pump 92-93 oct. gas witha 2500 stall and it's very street friendly and crazy bad makes peak hp at 6100 rpm 500+ hp also for anyone looking for info on Patriot Freedom Heads i like mine alot. I put them on my motor right out of the box and the casting in the runners are very smooth ..like glass perfect for a 383, even with a power adder as they flow very nice on the ex. side. Sorry for the long answer but when i was trying to find info on the Heads, all I could find was alot of bs about "They are junk China junk bla bla bla" not true try them out good bang for the buck!!
08-21-2011, 02:42 PM
#31
Ok guy im getting a hyd. roller 383 built
HEI
750 holley
rpm air gap
patriot freedom 185cc heads 72cc (mild portwork)
comp 12-423-8 224/230 .502/.510 (will this pull up to around 6000 rpm)
18cc dished pistons forged SRP
zero deck (should I)
200r4
about a 2000 rpm stall
Any guess on hp/tq
What head gasket do you guys recommend (thickness)
wanna keep it below 9.5:1
This is going in my almost DD 72 c10
HEI
750 holley
rpm air gap
patriot freedom 185cc heads 72cc (mild portwork)
comp 12-423-8 224/230 .502/.510 (will this pull up to around 6000 rpm)
18cc dished pistons forged SRP
zero deck (should I)
200r4
about a 2000 rpm stall
Any guess on hp/tq
What head gasket do you guys recommend (thickness)
wanna keep it below 9.5:1
This is going in my almost DD 72 c10
Are those heads aluminum? If so you can run more compression. Quench is one of the most important things to consider. Optimum is .030-.040 There's a couple different ways to achieve this.
The tighter the quench is the more compression you can run because the quench controls random detentation.
