sorry if these question have already been asked, but I’m a new GSR owner.
I’ve had several B18 tegs, one ls/vtec so I have some knowledge.
My question is would any B18A1 header fit the B17A1 motor?
besides that are there any compatibility issues where they differ?
thanks.
yeah, the header will fit but it will knock against the cross member being the deck height of the blocks differ about a 1/2 an inch or so. if you want one that fits perfectly, you’re going to have to get one for a 92-93 gsr. that is the only option as far as a header that will fit without any fitment issues.
The above information is incorrect.
The support brace which runs between the front crossmember and rear crossmember is not an issue. This did not come stock on the GSR and therefore it is perfectly OK just to remove that part. Hell, I remove it anyway simply for a little weight savings and simplification.
What is the issue is the oil pan. Some headers made for the b18a will not clear the b17a oil pan. The stock b18a header will not clear the b17a oil pan. And many of the cheaper aftermarket ones will not fit the b17a oil pan. If you’re getting a run of the mill aftermarket header (DC, Greddy…) then make sure you just order for the proper engine. If you’re getting a higher end header (SMSP, hytech…) then pretty much all of those are the same, they are designed to fit all b series engines, but it’s never a bad idea to inquire with the manufacturer before purchasing.
[QUOTE=Colin;1962267]The above information is incorrect.
What is the issue is the oil pan. Some headers made for the b18a will not clear the b17a oil pan. The stock b18a header will not clear the b17a oil pan. And many of the cheaper aftermarket ones will not fit the b17a oil pan. If you’re getting a run of the mill aftermarket header (DC, Greddy…) then make sure you just order for the proper engine.[/QUOTE]This statement is slightly incorrect also. The “run of the mill” aftermarket headers such as the DC and Greddy will fit both the B18A and B17A motors with pan clearance. I’ve run both before in the past and they are also listed as the same part numbers respectively (for the same years). They are not motor dependant but rather year dependant: the 90-91 made-to-fit DC and Greddy headers are a different length to the cat than those of the 92-93 ones. If you have a custom cat/exhaust (overall exhaust system length different than stock), then this becomes a moot point of course. They will however all bolt to the head of a B18A/B/C, B17/16 just fine (even the higher-end ones) as Colin has said with the higher-end ones (usually designed for DC2s) needing consideration to front cross-member clearance issues when used on a DA/Bs.
so for a person on a budget which header’s are known to clear the oil pan?
personally I don’t mind obx brand stuff (I donno if they clear or not), my goal with a header and catback would be to replace my leaky stock one without breaking the bank or wasting money on a replacement OEM style exhaust for the same price as something a tad nicer.
all B-series headers clear the oil pan on b16,b17,b18a/b, b18c. its just the amount of clearance between the pan and the header that changes.
running a itr 4-1 header on my b16 resulted in very little clearance (less than 1/4 inch), while putting the same header on my LSvtec, resulted in stock-like clearance
no saw no detrimental results to engine longevity or performance running a header close to the oil pan
besides thinning the oil quicker, so by what you said any B18 header will clear but fit very tight? That’s contradictory to previous posts.
So if I were to buy a B18A1 header it may clear but be very close to the pan, or might not clear the oil pan?
What is the height difference between B16,B18,B17, and B20 heads?, reason being it seems a lot of header’s are sold as B16/B18/B20 header’s, maybe they forgot to include B17 or is it different?
i never really researched it, but i never realized it when i bolted my header up until i put it on a lift to change the oil sometime later.
i am running a b16 head on my b18a block, and the b18a block is taller than the b16 block, so go figure. I think it has something to do with the way the exhaust pulls on the header, or the oil pan itself is different, but i’m not sure. as far as blocks and heads go, b16 and b17 are exactly the same. and any b16 header will fit a 17 the same way
since then i have changed to a 4-2-1 header for a b18c and have no problems running it on my b18a with b16 head. proper clearance is there
how much different is the b17 block from other blocks, the header compatibility question has to be a common question.
sheesh, so B16 header’s will fit and clear the B17 oil pan?
trying not to spend $400 on a part I can spend $150 on, that’s reasonable eh?
EDIT: The problem with a header made for specifically a B17A1 is that they aren’t a common motor and the header’s for them cost 3x what the same material for other applications do.
hrhmax: yeah, you are correct about the DC application being the same… but I wouldn’t count on every manufacturer being that way. Especially the super cheap ones (although they usually fit like crap anyway).
Brian, that may be the case with most aftermarket but definitely not stock. My stock b17a exhaust manifold didn’t clear the stock b18a pan. It cleared once I was done with my BFH!
what would be helpful is an list of header’s that are compatible besides the $400 ones specifically design for B17A1s, or maybe I can buy a new OEM exhaust for cheap, now that would be ideal.
edit: like viprtwo said… B17 block is the same as B16 block
B16s have a shorter deck height compared to B18s
B18 headers will fit B16s… they will just hang lower.
DC Sports made a 92-93 header that fit both blocks
edited