241 heads
02-03-2016, 02:20 PM
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241 heads are ported 241 heads worth the effort over stock 853 heads this is on sons car and he is on a tight buget I will be installing them myself so that will help on cost his car is a 99 trans am with cam and lt headers 410 gears for now also going to get fast 92 when we do the heads
02-03-2016, 02:39 PM
#4
241s and 853s are just about the same head. you could port the 853 and get the same results from a ported 241. and to answer your question, Yes, ported 241s would be a noticeable difference over stock 853s...but so would ported 853s. are you porting yourself or sending them out to be CNCd?
02-03-2016, 02:49 PM
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If you're going to buy 241's and then send them off, etc, check out advanced induction, Livernois, and Texas Speed on the vendor list to the right ----->>
the CNC packages they offer are excellent bang for buck, especially if you're budget constrained.
In the wrong hands, porting the heads can actually reduce power output, so be very wary of insanely low price porting options.
the CNC packages they offer are excellent bang for buck, especially if you're budget constrained.
In the wrong hands, porting the heads can actually reduce power output, so be very wary of insanely low price porting options.
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02-03-2016, 05:28 PM
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thanks for all your help but think we are just going to cut back on motocross racing this year and buy a good set of aftermarket heads that way I only got to do the job once if power level was not where we would like to be at around 450 to 475 rwhp
02-03-2016, 06:42 PM
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02-03-2016, 06:59 PM
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are ported 241 heads worth the effort over stock 853 heads this is on sons car and he is on a tight buget I will be installing them myself so that will help on cost his car is a 99 trans am with cam and lt headers 410 gears for now also going to get fast 92 when we do the heads
As some mentioned sending the heads to AI would be a good idea......I am considering doing that once I have $$$.
Anyways that is just my two cents.
02-03-2016, 09:25 PM
#15
I'd love to get a set of AFR heads, but the cost to do it right is prohibitive. After lots of research, I think Advanced Induction is the way to go on a budget.
AI High Compression 219cc LS1 Heads
AI High Compression 219cc LS1 Heads
Originally Posted by Advanced Induction
GM's #241 5.7L LS1 head casting is one of the most commonly available GM castings out there. While often swapped out in favor of 243's, the venerable 241 is still capable of producing great power for the $ considering how cheaply the castings can be obtained. Of the features of the 241 that are less than ideal, the large open chamber is the primary detraction. With our High Compression 241 CNC work we have managed to not only alleviate the issue, but to create a chamber design as good or better than the vaunted 243 casting. No longer will 241 applications be forced to trade compression for piston to valve clearance. Our HCR 241 will generate 11:1 compression on a stock 346cid LS1 while retaining the stock available P2V which allows the use of large duration cams without cutting piston reliefs! Static compression ratios into the 12.X:1 range are possible. Furthermore, at only 15 cc over stock volume this particular porting option sees gains of over 55 cfm on the intake utilizing a factory GM 2.00" valve. Typical gains for this CNC work are in the 40-55rwhp SAE range over the as cast 241, and 346cid LS1's can manage 440-470rwhp SAE with bolt ons and one of our daily drivable HR cam grinds.