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Pampered-Z · 06-16-2009, 11:13 AM

If your looking for 11's then even LE2 heads with a fairly aggressive cam will get you there. ( but it will not pass emissions!)

Making 450+ RWHP is going to be a bit tuff because you need to spin the engine fairly high, and @ 6800+ this is typically when you run into bearing failure. I perfer to target 400 RWPH and keep the RPMs no more then 6500 range and you can run 11's and it should remain very reliable.

For a stick, I like to shift @ 5800 or so to leave room for the engine to rev between shifts.

LE2 heads, and 306/847 or LE equivalent (forget which cam that is, but there is one), will make enough power in the 6500-6800 RPM range. They like to be spun higher, but with a stock bottom end I wouldn't suggest it if you want the engine to live long.

Here is a build we did a while back. The link below details all the parts we used.

http://www.97transam.com/

You can add ported heads ( head gaskets - Felpros will boost your CR a bit ) oil and fuel system upgrades ( I'd suggest 42LB injectors so if you rebuild and go 355.383 you would need to buy injectors again, and a 255 Pump is goof to near 500HP) This will allow you to figure out a ball park price on parts. ( note additional beer would be requires due to head installation! That could be a 5 case weekend!!! LOL! )

97T/A's engine was is great shape so at the time we didn't touch the oiling system and he isn't over reving! Car just missed running 11's and with the exception of the cam and converter is a mild bolton car, still has stock heads, TB, injectors. swapped the 3:23 for 3:42 gears for cruising and shortie headers, cat back and CAI. This car is a cruiser; he is targeting 11.60's so to not need a cage. Few upgrades and probably switching to 3:73s will put him right on his target.

Also built a similar setup but with heavily ported heads by LE's and his version of the 847 cam and longtubes- no cat Y-pipe, upgraded fuel pump, stock injectors and it made about 40 more HP. tighter stall and 3:73. Can't release his ET or MPH but it runs real good!

Both of the cars above are nearing the limits of their fuel systems, the LE headed engine is REAL close to maxing out the injectors, injectors are being upgraded to 42s and a 255 pump is replacing the stock unit. Also installed a new GM pump with the white spring and under hard breaking it will suck the pan dry! Larger oil pan is on order!

I would suggest looking at the 97TA cam install, and add heads, Felpro head gaskets to add a bit of compression and oil and fuel system.

You will need a loose converter for these big cams! The car will not idle in gear properly and they tend to stall out! Tuning cannot overcome this; you will need a converter so add that into your budget!

Note that both of these cars are complete cars, nothing removed power seat, T-tops, AC, ABS, emissions equipment etc are all still in the car and working! No light weight parts installed. both cars could also benefit from suspension upgrades as well!

Hope this helps, John

06-16-2009, 11:13 AM	#42
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	If your looking for 11's then even LE2 heads with a fairly aggressive cam will get you there. ( but it will not pass emissions!) Making 450+ RWHP is going to be a bit tuff because you need to spin the engine fairly high, and @ 6800+ this is typically when you run into bearing failure. I perfer to target 400 RWPH and keep the RPMs no more then 6500 range and you can run 11's and it should remain very reliable. For a stick, I like to shift @ 5800 or so to leave room for the engine to rev between shifts. LE2 heads, and 306/847 or LE equivalent (forget which cam that is, but there is one), will make enough power in the 6500-6800 RPM range. They like to be spun higher, but with a stock bottom end I wouldn't suggest it if you want the engine to live long. Here is a build we did a while back. The link below details all the parts we used. http://www.97transam.com/ You can add ported heads ( head gaskets - Felpros will boost your CR a bit ) oil and fuel system upgrades ( I'd suggest 42LB injectors so if you rebuild and go 355.383 you would need to buy injectors again, and a 255 Pump is goof to near 500HP) This will allow you to figure out a ball park price on parts. ( note additional beer would be requires due to head installation! That could be a 5 case weekend!!! LOL! ) 97T/A's engine was is great shape so at the time we didn't touch the oiling system and he isn't over reving! Car just missed running 11's and with the exception of the cam and converter is a mild bolton car, still has stock heads, TB, injectors. swapped the 3:23 for 3:42 gears for cruising and shortie headers, cat back and CAI. This car is a cruiser; he is targeting 11.60's so to not need a cage. Few upgrades and probably switching to 3:73s will put him right on his target. Also built a similar setup but with heavily ported heads by LE's and his version of the 847 cam and longtubes- no cat Y-pipe, upgraded fuel pump, stock injectors and it made about 40 more HP. tighter stall and 3:73. Can't release his ET or MPH but it runs real good! Both of the cars above are nearing the limits of their fuel systems, the LE headed engine is REAL close to maxing out the injectors, injectors are being upgraded to 42s and a 255 pump is replacing the stock unit. Also installed a new GM pump with the white spring and under hard breaking it will suck the pan dry! Larger oil pan is on order! I would suggest looking at the 97TA cam install, and add heads, Felpro head gaskets to add a bit of compression and oil and fuel system. You will need a loose converter for these big cams! The car will not idle in gear properly and they tend to stall out! Tuning cannot overcome this; you will need a converter so add that into your budget! Note that both of these cars are complete cars, nothing removed power seat, T-tops, AC, ABS, emissions equipment etc are all still in the car and working! No light weight parts installed. both cars could also benefit from suspension upgrades as well! Hope this helps, John __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!!