Small Block Head Comparison
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Joined: Oct 2005
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From: St. Charles Mo.
Small Block Head Comparison
I'm currently running "492" angle plug heads on an LT-1 shortblock. I've never seen any port volume or flow numbers for these heads and am wondering how they stack up to the L-31 Vortec heads? Would they be an upgrade?
One gear at a time
Joined: Aug 2003
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CI 8-9-10 Veteran
St. Jude Donor '07-'08-'09
Out fo the box, the vortec heads will outflow your 492 heads. Vortec heads don't mesh well with pop-up pistons. So, if your pistons have domes, you're better off having your heads done.
I had a set of 461X heads done by Mike Stark at www.cfmperformance.com . My heads now outflow just about any comparably sized aftermarket head.
I had a set of 461X heads done by Mike Stark at www.cfmperformance.com . My heads now outflow just about any comparably sized aftermarket head.
Drifting
Joined: Nov 2005
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From: Texas
Vortec's are 64cc chambered heads...they are worth 40-80 hp over
the 492's depending on how you cam...they outflow them by almost 40cfm..Raised Runner design...require a different intake.
492's flow around 200cfm
Vortecs.. 239 cfm... with 170cc ports.. Ebay/used/$300 a pair
the 492's depending on how you cam...they outflow them by almost 40cfm..Raised Runner design...require a different intake.
492's flow around 200cfm
Vortecs.. 239 cfm... with 170cc ports.. Ebay/used/$300 a pair
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Joined: Oct 2005
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From: St. Charles Mo.
Thanks for the info. Just what I was looking for. I didn't know about the popups being a hinderance with the Vortecs. Actually I guess they block flame travel with any head. Looks like just a light bowl clean-up and minor port work will fill my needs. Thanks again
