Afr heads with PAC 8002 spring upgrade.
#1
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Afr heads with PAC 8002 spring upgrade.
Just a public service announcement, learned with my new head guy the PAC 8002 spring "upgrade" you get with MK purchased heads is a standard hot rod spring, after talking to PAC they said in no way should them springs be used on a marine engine, may be ok in some applications but they do not recommend them, the 8002 is a PAC 1940 spring, or 1900 series, they say for marine you must run 1200 series or better
Not starting a war, just posting so when guys search in future the info is there, thread can be locked for all I care, as long as it's searchable.
https://m.summitracing.com/parts/rsc-pac-1940-16
Not starting a war, just posting so when guys search in future the info is there, thread can be locked for all I care, as long as it's searchable.
https://m.summitracing.com/parts/rsc-pac-1940-16
#2
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the 8002 spring is for a max lift of .650.it is not a good spring and i would not use it in a marine endurance engine.this is not a mk upgrade,it is an afr package,in other words,this spring is offered from any afr retailer.
Last edited by mike tkach; 01-20-2017 at 11:09 PM.
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I want people to be aware when being sold products, I can care less who is selling them, just a informational post.
Last edited by Full Force; 01-21-2017 at 05:03 AM.
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I wonder how many guys were told
"if you buy heads from me, you will have to change out the valve springs when they arrive, before you install them".
Prob not many. I dont know of many who actually knew that these were just dropped ship car heads with ductile iron seats and an inconel valve stuck in them. I used to think they were custom assembled marine ready packages.
At any rate, yea, that spring is entry level. If you have any fair amount of time on them, it be a good time to swap them out, and mic the spring heights while youre at it.
"if you buy heads from me, you will have to change out the valve springs when they arrive, before you install them".
Prob not many. I dont know of many who actually knew that these were just dropped ship car heads with ductile iron seats and an inconel valve stuck in them. I used to think they were custom assembled marine ready packages.
At any rate, yea, that spring is entry level. If you have any fair amount of time on them, it be a good time to swap them out, and mic the spring heights while youre at it.
#5
This really goes back for he fundamental point that buying "ready to bolt on and run" heads is not advisable. AFR, Dart, Brodix, Edelbrock, GM........whoever made them and whoever sold them really doesn't matter. You have to check every single thing you buy!
Didn't one pair of heads come from AFR with some really stout springs Tim? Something for a real big cam.
Didn't one pair of heads come from AFR with some really stout springs Tim? Something for a real big cam.
#6
Also, application does not dictate the level of thoroughness before use! IE.....it doesn't matter if they are for a race car, a boat, a musclecar, whatever the end use is, everything has to be verified!
Call summit (get ATEC on the line instead of a counter jockey) and ask them if their AFR (or any other heads) are really ready to run, the answer will be "hell yes"! It's up to the customer to decide if they want to roll the dice or not.
Call summit (get ATEC on the line instead of a counter jockey) and ask them if their AFR (or any other heads) are really ready to run, the answer will be "hell yes"! It's up to the customer to decide if they want to roll the dice or not.
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This really goes back for he fundamental point that buying "ready to bolt on and run" heads is not advisable. AFR, Dart, Brodix, Edelbrock, GM........whoever made them and whoever sold them really doesn't matter. You have to check every single thing you buy!
Didn't one pair of heads come from AFR with some really stout springs Tim? Something for a real big cam.
Didn't one pair of heads come from AFR with some really stout springs Tim? Something for a real big cam.
#10
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Yes, one set of tims heads, cam with solid roller springs. Something like 700lb open pressure if i recall