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#1
01-29-2023, 07:06 PM
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picked up a 79 firebird eng question
like the title reads,, has a ugly 500557 400 currently. want to build approx 365-375 hp 6x-8 heads on it presently,,should I spend any time on this or search for an early engine?
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#2
01-29-2023, 08:19 PM
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I had 400 hp in one of those for 10 years in my 77 stock block….held up just fine….I wouldn’t go much more than that though…..
I went with a 70 4 bolt main for my current 675 hp stroker |
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#3
01-29-2023, 10:28 PM
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wow thats pretty good whats the recipe ?
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#4
01-29-2023, 11:34 PM
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It was just some out of the box 72cc eheads/ flat top pistons forged rods and a performer RPM cam flat tapped and intake. Didn’t spin it past 6k
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#5
01-30-2023, 07:25 AM
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That block will get you to your hp goal, but those heads will need to get milled a whole bunch and have some very good porting done to them.
__________________
I do stuff for reasons. |
| The Following User Says Thank You to 25stevem For This Useful Post: | ||
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#6
01-30-2023, 08:38 AM
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What heads did you choose, got my eye on the following… 16 31 62 670
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#7
01-30-2023, 10:16 AM
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For your hp goals I would go for the 16 castings provide they have screw in rocker studs from the factory and that they also have not been milled any more then .005”.
Your next choice would be the 62 casting. The 31 is as good a pick as the 16s and the same milling rule applies . If you do not own these 31 castings already just note that since they are rare ram air heads they will cost a ton more .
__________________
I do stuff for reasons. |
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#8
01-30-2023, 11:34 AM
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Just gathering up a parts list. Wow have things gone up or not available. My last engine I built I bought a lot from ken brewer at ppr long gone now. He sold some decent rods for like 275 bucks now double and no eta
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#9
01-30-2023, 02:01 PM
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Or get a mini pop up piston to get the compression up. My 78 TA 6X-8s were 98cc. The 400 short block I hammered on for years with my RAIV heads was about 400 HP and a 557.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
| The Following User Says Thank You to Skip Fix For This Useful Post: | ||
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#10
01-30-2023, 03:51 PM
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Seen butler selling domed piston kits not sure why you don’t read about them on many forums
Sent from my iPhone using Tapatalk |
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#11
01-30-2023, 03:58 PM
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I have the entire engine I was talking about sitting on a stand in my garage….has everything pretty dam new on it mines the heads which I sold…..if you need the crank or forged rods or accessories let me know….I’ll hook ya up
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#12
02-10-2023, 04:17 PM
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Yellow198
What rods you have? Pm me Sent from my iPhone using Tapatalk |
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#13
02-12-2023, 12:14 AM
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Hey man just text ya….we’ll figure something out
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