396 E85 Street Car Build
08-30-2013, 09:54 AM
#21
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08-30-2013, 11:03 AM
#22
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Short answer first, 97REaper ..... you are half right. Your 6.0 inch rods will work fine, but .......... your 355 pistons will NOT.
Long answer now:
On an uncut (i.e. undecked) LT1 block the deck height is 9.025". Just using this 9.025" deck height as an example, to get your pistons flush with your block deck, your rod length plus your piston compression height plus one-half of your crank stroke must equal that 9.025' deck height.
For a 3.480" crank (i.e. 350/355 SBC engine), and 6.0" rod, your piston compression height works out to be 1.285".
For a 3.875" crank (i.e. 389/396 SBC engine), and 6.0" rod, your piston compression height works out to be 1.0875".
Soooooooo ....... in this example, if you just took those 1.285" compression height pistons and put them in your 396 build ........ your pistons would "stick out" .1975" inches ABOVE your 9.025" block deck!!!
Believe me, and mguidry629, and nitrous2fast ...... you cannot re-use your 355 build pistons in your 396 build.
Long answer now:
On an uncut (i.e. undecked) LT1 block the deck height is 9.025". Just using this 9.025" deck height as an example, to get your pistons flush with your block deck, your rod length plus your piston compression height plus one-half of your crank stroke must equal that 9.025' deck height.
For a 3.480" crank (i.e. 350/355 SBC engine), and 6.0" rod, your piston compression height works out to be 1.285".
For a 3.875" crank (i.e. 389/396 SBC engine), and 6.0" rod, your piston compression height works out to be 1.0875".
Soooooooo ....... in this example, if you just took those 1.285" compression height pistons and put them in your 396 build ........ your pistons would "stick out" .1975" inches ABOVE your 9.025" block deck!!!
Believe me, and mguidry629, and nitrous2fast ...... you cannot re-use your 355 build pistons in your 396 build.
Yea i apologize guys I over looked that. well on the bright side ill be getting pistons that are more nitrous friendly and up the shot.. stay tuned
08-30-2013, 11:05 AM
#23
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I've got a 244/256 .381 on a 105. The LSA is a little tight for E85 but the longish exhaust would work well with that stroke and full exhaust. Would really make a ridiculous amount of torque advanced a degree or two. I made 480/459 with a 240/252 107LSA HR on 100 unleaded with a 6speed, 9" and 28" bias ply MTs. 383 with worked on AFRs.
08-30-2013, 11:54 AM
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And, of course, Good Luck with your 396 build.
08-31-2013, 03:46 AM
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Im leaning towards probe pistons still looking for which rings to run with them.. http://www.summitracing.com/parts/pb...-030/overview/
09-05-2013, 09:33 AM
#30
Yes, gapless top ring, standard Napier 2nd. Machine work and ring gaps done by local race shop that races NHRA. Used Total Seal dry lube on install. They work great if setup properly.
09-06-2013, 04:59 AM
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I have a somewhat similar setup, 13.5:1 385, 24x/25x .61x/.62x 110 custom LE cam, 6" rods, M29 with a stock 3.42 rear, mild 185cc EB Porting heads, and it is very streetable to me, it's all in the tune. Also, I am running a Walbro pump and 60# injectors and a stock replacement FPR, and according to my wideband, at 6800 RPM I show 11.8 A/F ratio, so the fueling appears to be keeping up. With 11 more ci, better heads, and steeper gears, it should be easily over 450rwhp and very fun.
Did you have to do anything different to the pump to make it E85 friendly? Im Looking for a E85 friendly fuel pump and injectors.
09-06-2013, 08:16 AM
#32
No, I haven't done anything different to the fuel lines, pump, etc. I just change the fuel filter out with every oil change, run the Racetronix pump and 60# Seimens Deka injectors.
