


COMP Cams Guide Plate GM LS1 5/16 Flat
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
COMP Cams Guide Plate GM LS1 5/16 Flatflat, 1 piece, non adjustableFor 5 16" diameter pushrods and 8mm Rocker StudsFit GM LS engines with "cathedral port" cylinder heads (Ex. LS1, LS6)Designed using stereo lithography Techniques for an accurate fitFeature exact Stud placement and rounded contact pointsNecessary for high lift spring pressure environments of performance enginesHardened and black oxide finished Catalog User 1 This Part Fits: Year Make Model Submodel 2001 2004 Avanti II Base
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Your COMP Cams Guide Plate GM LS1 5/16 Flat orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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Exchange/Return Notes
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Product Reviews
★★★★★ 5
Exact fit, no trimming needed
Style: One Piece
Ordered this for my Ford F-150 and it dropped right into the airbox perfectly — same dimensions as the OEM filter, same end seals, same fit. No gaps, no air bypass around the edges. Clean swap in under five minutes. Engine runs smooth and the price is unbeatable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026
★★★★★ 5
very nice product
Style: Two Pieces
It fits perfectly. Easy to install.
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Reviewed in the United States on January 15, 2026
★★★★★ 5
Good Product and Price.
Style: One Piece
Great filter, fits perfectly. Very close to OEM fit. I have 2015 Mercedes E350, fit perfectly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 3, 2025
★★★★★ 5
Great plug
Style: Single
My car goes through these every 30,000 miles or so. But fantastic plug all around. Performs flawlessly even at almost 9000 rpm.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 11, 2015
★★★★★ 5
Product as described, Works great.
Style: Single
Product as described, Works great.
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Reviewed in the United States on August 27, 2015
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