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Author
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Topic: Question on Quench and compression
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tad2786
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Member # 8567
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Im in the process of building a 306 from a shortblock wich consists of stock polished crank, stock style forged rods, probe SRS forged pistons(10471-030 for twisted wedge heads, trick flow 170 twisted wedge 58cc track heat heads with come 1.6 roller rockers, Trick Flow stage 2 Camshaft, weiand excellarator intake and a quick fuel 650 carb. 3.55 gears, and a t5 in a 64 ford Ranchero.
So I am building this 306 as my first motor of my own and therefore just want it to be optimized. The machine shop that put the shortblock together decided to put in a dome top piston when I told them I wanted a 10-10.5 compression, in 91 octane street motor. Probe list's that piston as 11.4-1 compression with a 58cc head wich seemed to high for 91 to me. My friend who works for a local speed shop recomended me a super thick(.075") MLS head gasket. I bought them as the maching shop said it would bring me back down to a much more street friendly 10.25-1. THEN i learned about quench..... what would be the most cost effective, yet best option for me at this point? Or am I just over thinking this in a light, already overpowered car? What compression do you guys run on 91 octane with a CARBURETOR?
[ May 21, 2012, 09:26 PM: Message edited by: tad2786 ]
Posts: 54 | From: San Mateo | Registered: Aug 2008
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triple b
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Member # 8763
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get different heads if you want the quench i zero decked my block and my quech was perfect with a .041 headgasket little tricks make power not alot so is it worth it to you.....but it going in a ranchero not a drag car so i would just use the thick headgaskets and be do you will be happy either way not like your shooting for 10sec 1/4 mile
to be honest its hard to get a perfect quench you measure all the pistons in/out the hole i average a couple out and a few in its was a wash thus i call my motor zero decked but in actual life some are out the hole and some in....dude just run it and if you want more power lol go to a different head gasket thats what i do as long as the piston and valve have clearence and 91 is doing good for your compression
[ May 21, 2012, 09:51 PM: Message edited by: triple b ]
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1988 4cyl conv 306 HCI "sasha"
2004 tahoe
Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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tad2786
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Member # 8567
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posted
I agree with you on that point maybe I can have the combustion chambers and ports opend up a bit later on down the road and throw on a thinner head gasket. Bought the heads to go on a stock motor that why I went with the 58cc chamber. Don't want to get rid of them now if I can help it. THANKS
Posts: 54 | From: San Mateo | Registered: Aug 2008
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triple b
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Member # 8763
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posted
those heads will be easy for you to sell or trade for the bigger chamber ones if you need to
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1988 4cyl conv 306 HCI "sasha"
2004 tahoe
Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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turbo50
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Member # 6700
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posted
Mill the dome of the pistons the needed amount and zero deck the motor.
Run a vacuum advance dizzy to help tame the motor at part throttle and light load.
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.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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turbo50
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Member # 6700
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posted
Mill the dome of the pistons the needed amount and zero deck the motor.
Run a vacuum advance dizzy to help tame the motor at part throttle and light load.
--------------------
.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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