help me ASAP what heads to go with
05-12-2012, 07:35 PM
#1
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help me ASAP what heads to go with I'm in a bind right now getting ethier today! I got the option of getting some 799 (243) heads with prc springs a few chewed up intake valves from rockers for $420 or 241 heads proted for $500 quoting seller :
" this a set of rebuilt 241 castings that have been cleaned, pressure checked, milled (.024), seats cut with Serdi multi angled cutters and valves reground with 32* back cut, read for YOUR spring kit matching your cam. The chambers are now 62.5 cc, bowls blended, guide bosses streamlined and bumps removed. Includes new updated stem seals. These are really very nice and with the right cam/tune will make very good power, LS1 heads need little help to make unbelivable air flow. Valves are numbered to location.
" this a set of rebuilt 241 castings that have been cleaned, pressure checked, milled (.024), seats cut with Serdi multi angled cutters and valves reground with 32* back cut, read for YOUR spring kit matching your cam. The chambers are now 62.5 cc, bowls blended, guide bosses streamlined and bumps removed. Includes new updated stem seals. These are really very nice and with the right cam/tune will make very good power, LS1 heads need little help to make unbelivable air flow. Valves are numbered to location.
05-13-2012, 10:33 AM
#2
TECH Senior Member
Since this is a 2 part question I will divide my answer as such:
1- Regarding the 799 castings! I personally do not encourage the use of used springs (even PRCs) no matter what the reason is. From experience (due to not being rich) used parts WILL cost you more than new parts in the long run.
2- A 241 casting milled .024 will reduce PTV distance and limit you on size of cam to use.
IMO (since I've been modding LS motors since 1998) heads are THE MOST IMPORTANT mod you can make on a LS motor. All other mods will never reach full potential or advertised potential (for marketing purposes) if the heads are not done correctly.
Marketing is the enemy of good modification tools. I too fell into marketing gimmics (not knowing any better at the time) and budget heads are just that, marketing gimmic. There are companies that I do not buy from anymore because their marketing was (at the time I purchased) better than the product they sold.
Compared to older SBC heads, LS heads are a revolution in casting design and flow in stock form sometimes better than modified SBC heads.
Bottom line is find a set of "CLEAN" 243/799 castings with undamaged stock valves, send them to a reputed shop (like AI or TEA) and just get a good valve job on them. You'll be better off than any other used cheap heads. Decide on the cam you want to run and have the shop install the springs (matching cam requirement) at correct height.
You can do that for less than 1000 buckaroos and get better performance AND longevity out of your setup.
1- Regarding the 799 castings! I personally do not encourage the use of used springs (even PRCs) no matter what the reason is. From experience (due to not being rich) used parts WILL cost you more than new parts in the long run.
2- A 241 casting milled .024 will reduce PTV distance and limit you on size of cam to use.
IMO (since I've been modding LS motors since 1998) heads are THE MOST IMPORTANT mod you can make on a LS motor. All other mods will never reach full potential or advertised potential (for marketing purposes) if the heads are not done correctly.
Marketing is the enemy of good modification tools. I too fell into marketing gimmics (not knowing any better at the time) and budget heads are just that, marketing gimmic. There are companies that I do not buy from anymore because their marketing was (at the time I purchased) better than the product they sold.
Compared to older SBC heads, LS heads are a revolution in casting design and flow in stock form sometimes better than modified SBC heads.
Bottom line is find a set of "CLEAN" 243/799 castings with undamaged stock valves, send them to a reputed shop (like AI or TEA) and just get a good valve job on them. You'll be better off than any other used cheap heads. Decide on the cam you want to run and have the shop install the springs (matching cam requirement) at correct height.
You can do that for less than 1000 buckaroos and get better performance AND longevity out of your setup.
05-13-2012, 11:42 AM
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Damn ok thanks. I went with the 241 heads that were ported by a local head shop. Seller gave me the flow charts for the th 241's. Im shure I can sell them tho. The 799 heads had a few chewed up intake valves. I may be able to get the 799 for a lower price if he puts his oem springs on and I buy those new valves and springs to match my cam. So I wouldn't be able to run something like a 228 112 lsa cam do to ptvc?
Thanks
Thanks
05-13-2012, 01:51 PM
#7
If you got those 241s for a good deal I would use them. Properly ported 241s will more than hold their own with a supporting camshaft. There are still a few members on here who garage ported their 241s got a valve job and made tons of power with track times to back them up.
https://ls1tech.com/forums/generatio...ted-heads.html
properly chosen combo right there ^^^^
https://ls1tech.com/forums/generatio...ted-heads.html
properly chosen combo right there ^^^^
Last edited by got milk??; 05-13-2012 at 02:01 PM.
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05-13-2012, 03:01 PM
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I paid $500 for the 241's ported and already have a valve job. is that a good deal? its a better upgrade then my 339 I would say. I just bought LS7 lifters. Now I need to find a cam and springs. Anyone can chime in on cam suggestion that would be coo. thinking on the line of 228 112lsa. my concern is PVC...the heads were milled .024 and my block was decked .007 so that means now my piston goes above block deck .014. Would a good head gasket make up the .007 of the decking?
05-13-2012, 05:34 PM
#9
TECH Senior Member
.052-.014=.038 so stock MLS will work (quench)
228R should fit but degreeing the cam and measuring PTV clearance is recommended. To degree you'll need the tools and an adjustable timing chain.
228R should fit but degreeing the cam and measuring PTV clearance is recommended. To degree you'll need the tools and an adjustable timing chain.
05-13-2012, 06:59 PM
#10
Thats a good price for ported 241s. I like the prc double .650 for springs. With a 228r camshaft you will not be disappointed especially with your block being decked and those heads milled like they are. With a good tune your car is going to fly!!!
Last edited by got milk??; 05-13-2012 at 07:05 PM.
